Pen



FIG. 1 is a perspective view of the invention.

FIG. 2 is a front elevation view of FIG. 1.

FIG. 3 is a left elevation view of FIG. 1.

FIG. 4 is a right elevation view of FIG. 1.

FIG. 5 is a rear elevation view of FIG. 1.

FIG. 6 is a top plan view of FIG. 1; and,

FIG. 7 is a bottom plan view of FIG. 1. 

The ornamental design for a pen, as shown and described. 